一旦

yīdàn

HSK 5

一旦 — yīdàn

1. if; in case (something happens); once (something happens, then ...)

   一旦发现问题，马上通知我们。 yídàn fāxiàn wèntí mǎshàng tōngzhī wǒmen — If a problem is discovered, notify us immediately.

2. in a short time; before long; in one day

   一旦习惯了，这件事就很容易了。 yídàn xíguàn le zhèjiàn shì jiù hěn róngyì le — Once you get used to it, this becomes easy.